Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 36,187	$ 30,341
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,417	5,078
Stock-based compensation	2,369	2,479
Provision for credit losses	800	0
Net amortization of premiums and accretion of discounts on securities and borrowings	4,198	8,371
Amortization of other intangible assets	2,849	2,393
Gains on securities transactions, net	(271)	(2,416)
Proceeds from sales of loans held for sale	54,907	38,568
Gains on sales of loans, net	(1,795)	(598)
Originations of loans held for sale	(52,749)	(17,716)
Losses (gains) on sales of assets, net	10	(281)
FDIC loss-share receivable (excluding reimbursements)	560	3,920
Net change in:
Trading securities	0	14,233
Fair value of borrowings hedged by derivative transactions	4,719	2,781
Cash surrender value of bank owned life insurance	(1,963)	(1,764)
Accrued interest receivable	581	743
Other assets	(6,079)	(40,365)
Accrued expenses and other liabilities	3,993	8,104
Net cash provided by operating activities	54,733	53,871
Cash flows from investing activities:
Net loan repayments (originations)	95,706	(122,279)
Loans purchased	(190,741)	(139,935)
Investment securities held to maturity:
Purchases	(83,955)	(145,973)
Sales	0	11,666
Maturities, calls and principal repayments	58,907	85,798
Investment securities available for sale:
Purchases	(302,321)	(8,034)
Sales	2,081	13,974
Maturities, calls and principal repayments	366,882	38,678
Proceeds from sales of real estate property and equipment	3,919	4,551
Purchases of real estate property and equipment	(7,578)	(3,216)
Reimbursements from the FDIC	370	1,954
Net cash used in investing activities	(56,730)	(262,816)
Cash flows from financing activities:
Net change in deposits	154,875	182,627
Net change in short-term borrowings	93,632	(12,915)
Repayments of long-term borrowings	(155,000)	0
Cash dividends paid to preferred shareholders	(1,797)	0
Cash dividends paid to common shareholders	(27,916)	(25,512)
Purchase of common shares to treasury	(1,496)	0
Common stock issued, net	2,392	(948)
Net cash provided by financing activities	64,690	143,252
Net change in cash and cash equivalents	62,693	(65,693)
Cash and cash equivalents at beginning of year	413,800	830,407
Cash and cash equivalents at end of period	476,493	764,714
Supplemental disclosures of cash flow information:
Interest on deposits and borrowings	38,766	41,978
Federal and state income taxes	67	29,550
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	$ 663	$ 1,944